JP2007116940A - Combine harvester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To deform a balance spring in such a state as to be hardly entangled irrespective of vertical shaking of a reaping pre-treating part and to smoothly apply lifting operation force in a combine harvester equipped with a balance mechanism for applying the lifting operation force to the reaping pre-treating part supported freely vertically and shakably on a self-propelled machine body with the balance spring. <P>SOLUTION: The balance spring 21 is supported on a spring pedestal 26 of the self-propelled machine body. When the reaping pre-treating part 10 is changed into a lowering operation state, a spring contact part 22 provided in a pre-treating frame 11 contacts the balance spring 21 to deform the balance spring 21 by a load of the reaping pre-treating part 10. The balance spring 21 applies the lifting operation force to the reaping pre-treating part 10. A contact action surface 23 of the spring contact part 22 contacting the balance spring 21 is a contact action surface of a protruding circular arc. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  In the present invention, a pre-cutting processing unit is connected to a front part of a self-propelled machine body in a descending working state and an ascending non-working state so as to freely swing up and down, and is supported by one of the self-propelled machine body and the pre-cutting processing unit. The lowering work state so as to lighten the rise due to the ground reaction force of the pre-cutting processing part in the descending work state by contact of the balance spring and the spring contact part provided on the other side of the pre-cutting processing part and the pre-cutting processing part Combines provided with a balance mechanism for applying a lifting operation force to the pre-cutting processing section.

  The above combine has a balance mechanism even when the ground reaction force received from the ground is relatively weak when the pre-cutting processing unit comes into contact with the ground when the self-propelled aircraft tilts forward or there is a raised part in the field. By applying a lifting operation force to the pre-cutting processing unit, the pre-cutting processing unit is lifted slightly for its weight, and works while preventing thrusting of the weeding tools and the like onto the ground. Is now possible.

Conventionally, for example, the one disclosed in Patent Document 1 has been developed as this type of combine. What is shown in this Patent Document 1 is a balance mechanism configured as follows.
That is, an arm member 7 supported on the frame 2A of the self-propelled aircraft 2 so as to be swingable around the axis P2, a telescopic member connected over the frame 2A, a balance pull 13 externally fitted to the telescopic member, A spring receiver 14 provided on the member is provided, and the arm member 7 is operated to swing downward by the hydraulic cylinder 8 to operate the cutting frame 3a to swing downward about the axis P1, thereby cutting the cutting part 3 (to the pre-cutting processing part). Is equivalent to the lowering range A (corresponding to the lowering work state), the spring receiver 14 comes into contact with the balance spring 13 so that the balance spring 13 applies a lifting operation force to the cutting portion 3. Is.

Japanese Patent Laying-Open No. 2004-267123 (paragraph [0021], FIGS. 5, 8, and 9)

  When the above-described conventional technique is employed, it is necessary to provide an expansion / contraction member, and the weight of the balance mechanism tends to increase, and the balance mechanism tends to be large. In addition, in order for the balance spring to be smoothly deformed as the pre-cutting processing unit moves up and down, it is necessary to expand and contract without stretching the expansion and contraction member, so that the expansion and contraction member can be expanded and contracted accurately. It had to be produced and tended to be expensive.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a combine that can be advantageously obtained in terms of weight and size as well as in terms of economy, in which the balance spring acts while being smoothly deformed as the mowing pre-treatment portion swings up and down. There is.

In the first aspect of the present invention, the pre-cutting processing unit is connected to the front part of the self-propelled machine body so as to be swingable up and down in the lowered working state and the non-working state. The contact between the balance spring supported on one side and the spring abutting portion provided on the other of the self-propelled machine body and the pre-cutting processing unit reduces the rise due to the ground reaction force of the pre-cutting processing unit in the descending work state. In a combine provided with a balance mechanism for applying a lifting operation force to the pre-cutting processing part in the descending work state,
The abutting action surface of the spring abutting part abutting on the balance spring or the abutting action surface of the balance spring abutting on the spring abutting part is viewed in a direction along the swing axis of the pre-cutting processing part. The contact surface is a projecting arc.

  That is, while supporting the spring abutting portion and the balance spring in a state where there is no change in posture in the pre-cutting processing unit or the self-propelled machine body, a member such as a conventional expansion / contraction member is not necessary and the lowering work of the pre-cutting processing unit Even if the connection position in the state changes up and down and the relative posture changes between the spring abutting part and the balance spring, the balance spring remains at the axial center position of the balance spring or a position close to it. The abutting action surface of the spring abutting portion or the protruding arc of the balance spring is centered so that the balance spring does not twist easily, and the pre-cutting processing portion can be swung up and down while being smoothly deformed. it can.

  Therefore, according to the first aspect of the present invention, regardless of whether the pre-cutting processing unit swings up and down, the raising operation force of the pre-cutting processing unit appears while smoothly deforming in a state where the balance spring is not easily twisted, and the pre-cutting processing unit While the ascending operation at the time of grounding is performed smoothly, a balance mechanism is obtained while eliminating the configuration of a conventional elastic member that supports the spring abutting portion and the balance spring so that the posture can be freely changed. It can be obtained more compactly and at a lower cost.

  According to the second aspect of the invention, in the configuration of the first aspect of the invention, the spring contact portion is provided in the pre-cutting processing portion, the balance spring is formed of a coil spring, and the spring axis of the balance spring is The pre-cutting processing unit is supported by the self-propelled machine body in a state along a tangent line that is in contact with an arc trajectory along which the abutting action surface of the spring abutting unit moves by swinging up and down.

  That is, since the spring axis of the balance spring is along the tangent line, the load of the pre-cutting processing part is applied to the spring core as much as possible even if the connection position of the pre-cutting processing part in the descending operation state changes up and down. The balance spring is smoothly deformed in a state in which the balance spring is not easily twisted in the direction along, and the ascending operating force is always smoothly applied to the pre-cutting processing unit.

  Therefore, according to the second aspect of the invention, when the pre-cutting processing unit is grounded regardless of the change in the connection position of the pre-cutting processing unit in the descending operation state, the pre-cutting processing unit is smoothly raised and the pre-cutting processing is performed. The thrusting into the ground can be avoided with high accuracy.

  According to the third aspect of the invention, in the configuration of the first or second aspect of the invention, the spring abutting portion is constituted by a round bar material facing the self-propelled machine body.

  That is, the abutting action surface of the projecting arc of the spring abutting portion is obtained by utilizing the peripheral surface shape of the round bar.

  Therefore, according to the third aspect of the present invention, the spring is smoothly deformed in a state in which the balance spring is not easily twisted by the abutting action surface of the projecting arc of the spring abutting portion regardless of the vertical change in the connection position of the pre-cutting processing portion. While the vertical operating force of the processing unit is always applied smoothly, it can be obtained inexpensively from the production surface by using a round bar.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 and 2, a pre-cutting process is performed on a support stand 4 positioned at the front of a body frame 3 of a self-propelled aircraft equipped with a crawler type traveling device 1, a driving unit equipped with a driver seat 2, and the like. The base part of the pre-processing part frame 11 of the part 10 is connected rotatably, and the driving force of an engine (not shown) provided below the driver's seat 2 of the self-propelled machine body is applied to the transmission case of the pre-cutting processing part 10. It is configured to input the combined pre-processing unit frame 11 to drive the pre-cutting processing unit 10, and a threshing device 5 and a grain tank 6 are provided on the rear side of the machine body frame 3 to configure a combine. It is.

  This combine harvests rice, wheat, and the like, and an elevating operation mechanism 50 having a hydraulic cylinder 51 is provided between the pre-processing unit frame 11 of the pre-cutting processing unit 10 and the body frame 3. When the hydraulic cylinder 51 is operated, the lifting operation mechanism 50 swings the preprocessing unit frame 11 up and down with respect to the machine body frame 3 around the axis X, whereby the precutting processing unit 10 is cut. Ascending / descending operation is performed between a descending work state in which 12 is located near the ground and a non-working state in which the reaping device 12 and the like are elevated upward from the ground. When the pre-cutting processing unit 10 is in the descending work state and the self-propelled machine is run, the pre-cutting processing unit 10 includes a plurality of cutting weeds 13 arranged in the horizontal direction at the bottom of the pre-cutting processing unit 10. The weeding tool 14 supported at the front end portion is used to divide the planted culm into a planted culm to be harvested and a non-harvested planted culm, and a plurality of planted culms of a plurality of planting strips to be harvested Weed and guide so as to divide into the corresponding trigger paths 15 of the trigger paths 15 and guide the planted cereals introduced into each trigger path 15 by the trigger device 16 corresponding to each trigger path 15 and process it. At the same time, the reaping process is performed by the clipper-shaped reaping device 12, and the cereal grains from the reaping device 12 are conveyed backward by the supply device 17 to be threshed by the threshing device 5. Supplied to the starting end of Idochen 5a. The threshing device 5 supplies the tip side to a handling room (not shown) while holding the stock side of the harvested cereal rice cake in the rearward direction of the machine body by the threshing feed chain 5a, and rotating the tip side of the handling cylinder (not shown). Threshing is performed by (not shown). The grain tank 6 collects and stores the threshed grains conveyed from the threshing device 5.

  As shown in FIGS. 3 and 5, the elevating operation mechanism 50 is an elevating operation body supported by a pair of left and right support plates 52 of the support base 4 so as to be swingable around an axis 53 a that faces the self-propelled machine body. 53, the lifting / lowering operation body 53 includes the hydraulic cylinder 51 having one end connected to the free end side and the other end connected to a cylinder bracket 54 fixed to the body frame 3.

  The lifting operation body 53 is connected to the pair of left and right support plates 52 so as to be rotatable around the shaft core 53a, and is connected to the self-propelled machine body laterally connecting shaft 53b, and can be integrally rotated from both ends of the connecting shaft 53b. An extending swing arm 53c and a self-propelled machine body side operation shaft 53d connecting the free ends of the pair of left and right swing arms 53c are provided. The pair of left and right swing arms 53c and the operation shaft 53d are configured by a single round bar material formed by bending. The operation shaft 53 d of the lifting operation body 53 is arranged so as to abut on the rear side of the pre-processing unit frame 11 of the pre-cutting processing unit 10. Both end sides of the self-propelled machine body-side locking rod 55 arranged on the front side of the pre-processing unit frame 11 are connected to support brackets 56 attached to the swing arm 53c, and an intermediate portion of the locking rod 55 is The lifting operation body 53 is linked to the pre-processing unit frame 11 so that the lifting operation body 53 is coupled to the support bracket 57 attached to the pre-processing unit frame 11. The pre-processing unit frame 11 is locked so as to swing around 53a. The elevating cylinder 51 is connected to a cylinder bracket 58 attached to the operation shaft 53d of the elevating operation body 53.

  That is, in the lifting operation mechanism 50, the hydraulic cylinder 51 moves the lifting operation body 53 up and down around the shaft core 53 a so that the operation shaft 53 d of the lifting operation body 53 contacts the pressure receiving portion 11 a of the preprocessing unit frame 11. The pretreatment section frame 11 is swung up and down by the hydraulic cylinder 51 via the lifting operation body 53 by bringing it into contact and pushing up and receiving and supporting it. Elevating operation to the state or descending work state.

  The screw shaft 60 shown in FIGS. 3 and 5 is rotatably supported by the support bracket 56 and interlocked with the electric motor 61. The electric motor 61 drives the screw shaft 60 in the forward and reverse rotation directions. As a result, the feed piece body 62 engaged with the pre-processing unit frame 11 is moved to move the pre-processing unit frame 11 along the input shaft 63 inserted through the locking bar 55 and the base 11b. Then, by sliding operation in the lateral direction of the self-propelled machine body, the pre-processing unit frame 11 (cutting pre-processing unit 10) is moved away from the driving unit and connected to the driving unit (see FIG. 3). The operation position is switched to the connected work position (see FIG. 4).

  As shown in FIG. 10, the hydraulic cylinder 51 is a single-acting cylinder. As a result, when the control valve V connected to the hydraulic cylinder 51 is switched to “up”, pressure oil from the hydraulic pump P is supplied by the control valve V and is driven to the extension side by the hydraulic oil. Then, when the pre-cutting processing unit 10 is raised and the control valve V is switched to “down”, the hydraulic oil is discharged by the control valve V, and because of the weight of the pre-cutting processing unit 10, Is operated to lower the pre-cutting processing unit 10 and the control valve V is switched to “neutral”, whereby supply and discharge of hydraulic oil is stopped by the control valve V, and the pre-cutting processing unit 10 is operated. Stop operation is performed so as not to descend from this operation position to the operation position in the ascending non-working state or the descending working state.

  Accordingly, when the pre-cutting processing unit 10 is stopped at the connection height at which the cutting height by the cutting device 12 is set to the set cutting height, the hydraulic cylinder 51 moves the pre-cutting processing unit 10 from the connection height. It becomes a descent stopper that stops so as not to descend. Further, when the pre-cutting processing unit 10 is grounded and receives a grounding reaction force in a state where the hydraulic cylinder 51 is a lowering stopper for the pre-cutting processing unit 10, the hydraulic cylinder 51 is operated to the extension side due to the grounding reaction force. Then, the pre-cutting processing unit 10 is allowed to be raised from the connection height of the set cutting height by the ground reaction force.

  As shown in FIG. 1, among the plurality of weed pods 13 of the pre-cutting processing unit 10, the weeding tool 14 of the weed pod 13 located on the laterally outermost side of the pre-cutting processing unit 10 is slightly more than By attaching the casing 18 to the lower part on the rear side, a ground plane portion 18a formed by the bottom surface of the casing 18 is provided in each of the lateral weed ridges 13.

  As shown in FIGS. 3, 6, 7, and the like, a balance mechanism 20 including a balance spring 21 between the pre-processing unit frame 11 of the pre-cutting processing unit 10 and the front end of the body frame 3 of the self-propelled machine body. Is provided.

  The balance mechanism 20 includes the balance spring 21 provided on the self-propelled machine body, and a spring abutting portion 22 provided on the rear side of the self-propelled machine body of the preprocessing unit frame 11.

  The balance spring 21 is constituted by a coil spring. As shown in FIG. 7, the abutting action surface 23 of the spring abutting portion 22 draws an arc trajectory T about the swing axis 53 a of the lifting operation body 53 by the vertical swing of the pre-cutting processing unit 10. Moving. When the pre-cutting processing unit 10 is lowered from the ascending non-working state and reaches the connection height of the standard cutting height h (see FIG. 11) in the descending working state, a tangent L that touches the arc locus T is set. The balance spring 21 is configured such that the spring axis 21a of the balance spring 21 is disposed along the tangent L, and the base end side holder 25 of the spring holder 24 is fixed to the body frame 3 and is seated on the spring cradle 26. A spring telescopic guide 27 fixed to the spring receiving base 26 is supported via the spring holder 24 so as to be received and supported by the plate 26a. The balance spring 21 is covered with a flexible spring cover 30 so as to allow expansion and contraction of the balance spring 21.

  As shown in FIGS. 7, 8, and 9, the spring holder 24 is locked to the distal end side holder 28 in which the locking protrusion 28 a enters and is locked to the distal end side of the balance spring 21, and to the proximal end side of the balance spring 21. The proximal end side holder 25 and the proximal end side holder 25 are fastened by connecting the locking protrusions 28a and 25a of the proximal end side holder 25 and the proximal end side holder 25 with the protrusion 25a entering and locking. 25 and a connecting rod 29 that compresses and deforms the balance spring 21 by a tightening force. The balance spring 21 is held in an initially compressed and deformed state. The front end side holder 28 of the spring holder 24 constitutes a load receiving portion (a contact working surface with respect to the spring abutting portion 22) that receives a load by the spring abutting portion 22 of the pretreatment portion frame 11 of the balance spring 21. A pair of the spring telescopic guide rods 27 extending from the seat plate 26 a of the spring pedestal 26 pass through the proximal end side holder 25 and the distal end side holder 28, and from the distal end side holders 28 of the spring telescopic guide rods 27. The spring holder 24 is retained by the retaining pin 27a (see FIG. 6) attached to the protruding end, so that the balance spring 21 is in a state in which the initial compression deformation is applied. 26.

  The spring contact portion 22 of the pre-processing unit frame 11 is formed of a round bar material by being configured by the operation shaft 53d of the lifting operation body 53, and the pre-cutting processing unit 10 is lowered to the lowering work state. When operated, the balun spring is brought into contact with the load receiving portion (tip-side holder 28) of the balance spring 21 by the contact acting surface 23 formed by the peripheral surface of the round bar, and is determined by the load determined by the weight of the pre-cutting processing portion 10. 21 is pressed. Since the contact surface 23 of the spring abutting portion 22 is a circumferential surface of a round bar that faces the self-propelled machine body, it has a projecting circular arc as viewed in the direction along the swing axis X of the pre-cutting processing portion 10. The lowering operation state of the pre-cutting processing unit 10 is a contact working surface and supports the spring contact unit 22 and the balance spring 21 in a state in which the pre-processing unit frame 11 and the machine body frame 3 are not changed in posture. Even if the coupling position at the top and bottom changes up and down and the relative posture changes between the spring contact portion 22 and the balance spring 21, the load position of the balance spring 21 is always the position of the axis 21 a of the balance spring 21. Alternatively, the load of the pre-cutting processing unit 10 is the balance spring 21 in a state in which the load is applied to the balance spring 21 in a state close to that and the direction in which the load of the balance spring 21 is applied is as much as possible along the spring axis 21a of the balance spring 21. In Hunt. Thereby, even if the connection position in the lowering work state of the pre-cutting processing unit 10 changes up and down, the balance spring 21 extends and contracts smoothly in a state without being twisted to give the pre-cutting processing unit 10 a lifting operation force. To do.

When the pre-cutting processing unit 10 is operated to be lowered from the ascending non-working state to reach the highest connection height in the descending working state, the spring contact part 22 of the pre-processing part frame 11 is loaded with the load receiving part (front end side spring) of the balance spring 21. When the pre-cutting processing unit 10 comes into contact with the holder 28) and further moves down, the hydraulic cylinder 51 becomes the stroke end on the lowering side, and the pre-cutting processing unit 10 reaches the lowest connection position in the descending work state. Up to this point, the spring contact portion 22 of the pretreatment unit frame 11 is configured to press the balance spring 21 by the load of the pre-cutting processing unit 10 and perform compression operation. As a result, the balance mechanism 20 applies an ascending operation force to the pre-cutting processing unit 10 by the balance spring 21 in a state where the pre-cutting processing unit 10 is operated in the descending work state, and the pre-cutting processing unit 10 When the grounding reaction force is received from the ground after being grounded by the portion 18a, the pre-cutting processing unit 10 is lifted by the grounding reaction force even if the grounding reaction force is light relative to the weight of the pre-cutting processing unit 10. Making it possible.
The balance spring 21 is assembled in such a state that it does not reach the elastic deformation limit even when the hydraulic cylinder 51 reaches the lower stroke limit, and can still be elastically deformed to the shortened side.

That is, this combine performs the harvesting operation based on the following harvesting method.
That is, as shown in FIG. 10, the lifting lever 36 linked to the electromagnetic operation portion of the control valve V of the hydraulic cylinder 51 via the control means 35 is switched to the lowered position, and the control valve V is switched to “down”. Then, the hydraulic cylinder 51 is operated to the lowered state, and the cutting pretreatment unit 10 is lowered by the hydraulic cylinder 51 from the raised non-working state. When the pre-cutting processing unit 10 is lowered to the highest position in the descending work state, the spring contact portion 22 of the pre-processing unit frame 11 comes into contact with the load receiving portion (front end side holder 28) of the balance spring 21, and the balance spring 21 is lowered. Thus, the lowering speed of the pre-cutting processing unit 10 is lower than before. As a result, it is easily recognized that the pre-cutting processing unit 10 has entered the descending work state, and thereafter, the pre-cutting processing unit 10 is further lowered while taking care not to lower the pre-cutting processing 10 too much. When the pre-cutting processing unit 10 is further lowered to reach a set connection height at a desired set cutting height, such as a standard connection height at which the tip side of the weed culm 13 has a set standard cutting height h, the lift lever 36 is switched to the neutral position, the control valve V is switched to “neutral” to maintain the hydraulic cylinder 51 in the neutral state, and the hydraulic cylinder 51 is used as a lowering stopper for the pre-cutting processing unit 10 before cutting. Harvesting is performed while the processing unit 10 is supported at the set connection height that has emerged from the ground to the set cutting height, and the planted culm is cut at the set cutting height. When the self-propelled aircraft tilts forward or has a raised portion on the ground, the grounding reaction force from the ground received by the pre-cutting processing unit 10 by being grounded by the ground plane portion 18a, and the balance mechanism 20 The harvesting pretreatment unit 10 is lifted higher than the set connection height by the lifting operation force by the balance spring 21, and harvesting travel is performed while preventing the weeding tool 14 and the like from being pushed into the ground or the raised portion.

Moreover, in this combine, even if it employ | adopts the following harvesting methods, a harvesting operation can be performed.
That is, when the pre-cutting processing unit 10 is lowered to the lowering operation state, and the pre-cutting processing unit 10 is lowered until it contacts the ground plane 18a, the lifting lever 36 is switched to the neutral position, and the control valve V is set to “neutral”. And the hydraulic cylinder 8 is maintained in a stopped state, and the harvesting processing is performed while the pre-cutting processing unit 10 is grounded to follow the undulations of the field scene by the ground plane 18a.

  FIG. 11 shows the relationship between the lifting range A on the tip side of the weed culm of the pre-cutting processing unit 10 to which the upper operating force is applied by the balance mechanism 20 and the horizontal plane B in a state where the self-propelled machine body is positioned on the horizontal plane. The raising / lowering range A is set so as to satisfy the relationship shown. That is, in a state where the center a of the lifting range A is positioned lower than the horizontal plane B, and the tip side of the weed ridge floats from the horizontal plane B to the set standard cutting height h and is in a horizontal posture. The tip of the weed ridge is set so as to be located at a position higher than the elevation range center a.

  That is, as shown in FIG. 12 (a), when the slope S is caused to self-run from the ridge C to enter the field E, the pre-cutting processing unit 10 is set to the connection height in the forward-lowering posture, and the pre-cutting processing unit The center of gravity is lowered by the lowering of 10 and the traveling device 1 is moved to the slope S from the heel C, and the pre-cutting processing unit 10 comes into contact with the ground so that the occurrence of impact can be suppressed and the self-running movement is possible. It is. As shown in FIG. 12 (b), after entering the slope S in this way, when entering the field E from the slope S, the pre-cutting processing unit 10 is self-propelled due to the ground reaction force received by touching the field scene. It rises with respect to the body and can enter the field E while avoiding the weeding tool 14 thrusting into the field scene.

  As shown in FIG. 8, a bolt hole 40 and a pin hole 41 are provided in the tip side holder 28 of the spring holder 24, and a spring pressure adjusting plate 42 can be attached to and detached from the surface side of the tip side holder 28 as shown in FIG. It is. As shown in FIGS. 13 and 14, the spring pressure adjusting plate 42 includes a through hole 42 a, a bolt hole 43, and a rotation prevention pin 44, and the rotation prevention pin 44 is engaged with the pin hole 41 of the distal end side holder 28, so that the spring is adjusted. The connecting bolt 45 is attached to the pressure adjusting plate 42 and the bolt holes 43, 40 of the tip side holder 28 to be attached to the tip side holder 28.

  That is, when the forced weeding device 46 is attached to the front side of the raising device 16 of the pre-cutting processing unit 10 as shown in FIG. 16, the weight of the pre-cutting processing device 10 increases due to the weight of the forced weeding device 46. . Thereby, when the forced weeding device 46 is attached, the spring pressure adjusting plate 42 is attached to the tip side holder 28 of the spring holder 24. Then, for example, when the pre-cutting processing unit 10 reaches the connection height of the set standard cutting height h, when the connection height of the setting standard cutting height h is obtained without the forced weeding device 46. In comparison, the amount of deformation by which the balance spring 21 is elastically deformed by the load of the pre-cutting processing unit 10 increases, and a large ascending operating force is applied to the pre-cutting processing unit 10 by the balance spring 21, so that the pre-cutting processing unit 10 is applied. Regardless of the increase in weight, the vehicle is slightly lifted by the ground reaction force.

  As shown in FIG. 17, even when the spring pressure adjustment plate 42 is attached, the pre-cutting processing unit 10 is too heavy to adjust the balance mechanism 20 to a state in which an appropriate lifting operation force is exerted. Moreover, it is preferable to adjust the spring pressure by providing the balance spring 21 with an auxiliary balance spring 21 a arranged concentrically with the balance spring 21.

  18 and 19 show an elevating operation mechanism 50 and a balance mechanism 20 having an implementation structure. In the elevating operation mechanism 50, a hydraulic cylinder 51 is provided with a cylinder bracket 59 provided on the preprocessing unit frame 11, and It is connected to a cylinder bracket 3 a provided on the body frame 3.

  The balance mechanism 20 includes two balance springs 21 arranged side by side in the lateral direction of the self-propelled machine body at a position above the hydraulic cylinder 51 and a spring provided on the rear side of the self-propelled machine body 11 of the pre-processing unit frame 11. A contact portion 22 is provided.

  Each balance spring 21 is constituted by a coil spring. The abutting action surface 23 of the spring contact portion 22 moves while drawing an arc locus T about the vertical swing axis X of the pre-cutting processing unit 10 by the vertical swinging of the pre-cutting processing unit 10. As the pre-cutting processing unit 10 descends from the non-operating state, the spring contact portion 22 starts to contact the load receiving portion formed by the front end side holder 28 of each balance spring 21. Each of the balance springs 21 has a spring axis 21a of the balance spring 21 arranged along the tangent line L, and the base end side holder 25 of the spring holder 24 is fixed to the body frame 3. A spring telescopic guide 27 fixed to the spring receiving base 26 is supported via the spring holder 24 so as to be received and supported by the seat plate 26a of the base 26. Each balance spring 21 is covered with a flexible spring cover 30 so as to allow expansion and contraction of the balance spring 21.

  The spring holder 24 includes a locking cylinder portion 28 a inserted into the distal end side of each balance spring 21, and the distal end side holder 28, and a locking cylinder that serves as a spring buckling prevention base spring side of each balance spring 21. The locking tube portions 28a and 25a entering the one balance spring 21 of the proximal end side holder 25, the distal end side holder 28 and the proximal end side holder 25, and the other balance spring 21 are locked. A connecting rod 29 is provided for connecting the distal end side holder 28 and the proximal end side holder 25 by tightening and connecting the locking cylinder portions 25a and 28a that are intruding, and compressing and deforming each balance spring 21 by the tightening force. The two balance springs 21 are collected and held in a state in which initial compression deformation is applied to each balance spring 21.The distal end side holder 28 of the spring holder 24 constitutes a load receiving portion that receives a load by the spring contact portion 22 of the pretreatment portion frame 11 of each balance spring 21. A pair of the spring telescopic guide rods 27 extending from the seat plate 26 a of the spring pedestal 26 pass through the proximal end side holder 25 and the distal end side holder 28, and from the distal end side holders 28 of the spring telescopic guide rods 27. By preventing the spring holder 24 from being removed by the retaining pin 27a attached to the projecting end, each balance spring 21 is supported by the spring pedestal 26 with initial compression deformation applied. ing.

  The spring contact portion 22 of the pretreatment unit frame 11 is constituted by a self-propelled machine body-oriented round bar attached to the pretreatment unit frame 11 via the cylinder bracket 59, and the cutting pretreatment unit 10 is in the descending work state. When the lowering operation is performed, the abutting action surface 23 formed by the circumferential surface of the round bar material comes into contact with the load receiving portion (the tip side holder 28) of each balance spring 21 and is determined by the weight of the pre-cutting processing portion 10. Each balun spring 21 is pressed by the load. The abutting action surface 23 of the spring abutting portion 22 is a circumferential surface of a self-propelled machine body-oriented round bar, so that a projecting circular arc is seen in the direction along the vertical swing axis X of the pre-cutting processing portion 10. The pre-cutting processing unit 10 is lowered while the spring contact unit 22 and the balance springs 21 are supported by the pre-processing unit frame 11 and the machine body frame 3 without any change in posture. Even if the connection position in the working state changes up and down and the relative posture changes between the spring abutting portion 22 and the balance spring 21, the load direction of the balance spring 21 is the spring axis 21a of the balance spring 21. Thus, the load of the pre-cutting processing unit 10 is applied to the balance spring 21 in a state that is in a direction along as much as possible. Thereby, even if the connection position in the lowering work state of the pre-cutting processing unit 10 is changed up and down, each balance spring 21 is smoothly expanded and contracted in a state without being twisted, and the lifting operation force is applied to the pre-cutting processing unit 10. Give.

[Another Example]
As described in the above embodiment, the abutting action surface 23 that abuts the balance spring 21 of the spring abutting portion 22 is used as a projecting arc abutting action surface, and a round bar is attached to the tip side holder 28. The abutting action surface that abuts against the spring contact portion 22 of the balance spring 21 may be implemented as a projecting arc abutting action surface, and the object of the present invention can be achieved even if this embodiment is adopted. Can do.

  As shown in the above embodiment, the spring contact portion 22 of the pre-cutting processing unit 10 is provided toward the pre-cutting processing unit 10 and the balance spring 21 is provided toward the self-propelled machine body. The balance spring may be provided in the direction of the pre-cutting processing unit 10, and the object of the present invention can be achieved by either method.

  As in the above-described embodiment, the spring pad 22 of the pre-cutting processing unit 10 is configured and implemented using the lifting operation body 53 of the lifting operation mechanism 50, and is also configured and implemented by providing a dedicated round bar. In any case, the object of the present invention can be achieved.

Side view of the entire combine Top view of the entire combine Front view of elevating operation mechanism and balance mechanism with pre-processing unit frame approaching operation unit side Front view of the lifting and lowering operation mechanism and the balance mechanism in a state where the pre-processing unit frame is on the side far from the driving unit Side view of the lifting mechanism Side view of balance mechanism Side view of balance mechanism with balance spring cross-section Front view of balance spring Cross section of balance spring Explanatory drawing showing the harvesting procedure and hydraulic circuit Explanatory drawing showing the working range of the balance mechanism (A) is a side view showing the point of carrying the combine into the field, (B) is a side view showing the state where the pre-cutting processing unit is in contact with the field when the combine is carried in Front view of the balance mechanism with the spring pressure adjustment plate attached Perspective view of spring pressure adjustment plate Side view of the balance mechanism with the spring pressure adjustment plate attached Side view of pre-cutting processing unit with forced weeding device installed Sectional view showing the spring pressure adjustment procedure of the balance spring Side view of elevating / lowering operation mechanism and balance mechanism provided with another implementation structure Front view of balance mechanism with different implementation structure

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pre-cutting processing part 20 Balance mechanism 21 Balance spring 21a Spring shaft core 22 Spring contact part 23 Contact action surface X Oscillation axis T of pre-cutting process part T Circular locus L Tangent

Claims (3)

At the front part of the self-propelled machine body, the pre-cutting processing part is connected in a descending working state and an ascending non-working state so that it can swing up and down
Before cutting in the descending work state due to a contact between the balance spring supported by one of the self-propelled machine body and the pre-cutting processing unit and the spring contact part provided on the other of the self-propelled machine body and the pre-cutting processing unit. A combine provided with a balance mechanism for applying a lifting operation force to the pre-cutting processing unit in the descending work state so as to lighten the rise due to the ground reaction force of the processing unit,
The abutting action surface of the spring abutting part abutting on the balance spring or the abutting action surface of the balance spring abutting on the spring abutting part is viewed in a direction along the swing axis of the pre-cutting processing part. Combine with a projecting arc contact surface. The spring pad is provided in the pre-cutting processing unit,
The balance spring is a coil spring, and the spring axis of the balance spring is in a state along a tangent line that is in contact with an arc locus on which the abutting action surface of the spring abutting portion moves due to vertical swing of the pre-cutting processing portion. The combine according to claim 1 supported by a self-propelled aircraft.   The combine according to claim 1 or 2, wherein the spring abutting portion is formed of a round bar material facing the self-propelled machine body.

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